Measures to secure the battery, no doubt. In my 2001 CLK I noticed that
when the mobile phone (Nokia GSM) was left to charge in the integrated
cradle, it continued to do just that even when the ignition was completely
However, earlier this year I had the new cradle system fitted to take the
new Nokia 6310i and I found that the phone/system switches itself off after
about 10 min if the ignition is off. This change was later confirmed by the
Merc dealer who fitted the kit.
NB: To reply directly replace "nospam" with "schmetterling"